1. 動詞
   challenge第三者單數現在式:
   及物動詞:
   挑戰...(人)
   懷疑...(事)
   質疑...(事)
   反對...(事)
   對...(事)提出異議
   激發...(人)
   考驗...(人)的能力
   考驗...(人)的決心
   

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   同義字詞
   contest,dispute,impeach,oppugn,query,question
   dare,defy,stump
   bear,claim,demand,necessitate,need,require,take,want,warrant
   

2. 名詞
   challenge複數:
   挑戰
   艱鉅的事
   有作為的工作
   邀請比賽
   質疑
   指責
   異議
   警衛或令哨兵等的: 查問口令, 盤問
   (對陪審員出庭等表示的)反對
   

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   同義字詞
   complaint,demur,demurral,demurrer,difficulty,exception,expostulation,fuss,kick,objection,protest,question,remonstrance,stink
   case,knot,matter,problem,trouble
   

例句

1. The challenges ahead are easy to spot .
2. So there are a lot of challenges for us .
3. But direct challenges to The System are idiotic.
4. And if anybody challenges me, there is no problem.
5. Its 1 mile track with tight bends challenges jockeys.
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